OFFSET
1,1
COMMENTS
The well-known integers very close to e^(pi sqrt n) for n=A003173(m) are of the form (12(k^2-1))^3+744. This sequence gives the rounded n-value corresponding to a given k.
REFERENCES
See A138852 for links, references and more information.
PROG
(PARI) A139388(n)=round((log(744+(12*(n^2-1))^3)/Pi)^2)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
M. F. Hasler, Apr 17 2008
STATUS
approved